Ipsilateral electric acoustic stimulation of the auditory system: results of long-term hearing preservation

Audiol Neurootol. 2006:11 Suppl 1:49-56. doi: 10.1159/000095614. Epub 2006 Oct 6.

Abstract

Objective: To evaluate long-term ipsilateral hearing preservation in patients who underwent cochlear implantation for the combined electric acoustic stimulation of the auditory system.

Methods: This was a prospective observational study conducted at a tertiary referral center. Twenty-three subjects were implanted with the MED-EL C40+ standard or C40+ medium electrode using an atraumatic surgical protocol via an anterior-inferior cochleostomy approach. The desired insertion depth was 18-24 mm or 360 degrees. All patients showed significant low-frequency hearing prior to surgery and monosyllabic word scores did not exceed 40% in the best aided condition. Pure-tone audiometry was performed prior to implantation and at distinct intervals after surgery.

Results: Nine patients (39.1%) showed complete pure-tone audiometric hearing preservation (0-10 dB) over an average of 29 months. Seven subjects (30.4%) showed partial preservation of residual hearing (hearing loss 15-40 dB) until an average of 25 months. Delayed loss of residual hearing was observed in 5 cases (21.7%) and 2 patients (8.6%) completely lost residual hearing during or immediately after surgery. Freiburger Monosyllabic word understanding scores in a group of patients with complete hearing preservation increased from 13.1% preoperatively to 75% in the electric acoustic stimulation condition.

Conclusion: This study documents that complete and partial preservation of ipsilateral hearing after cochlear implantation can be achieved in about 70% of cases over an average period of 27.25 months when using 360 degrees electrode insertions.

MeSH terms

  • Acoustic Stimulation / methods*
  • Adult
  • Aged
  • Audiometry, Pure-Tone
  • Auditory Threshold
  • Cochlear Implants*
  • Electric Stimulation / instrumentation
  • Electrodes, Implanted
  • Female
  • Hearing Loss, Bilateral / diagnosis
  • Hearing Loss, Bilateral / surgery
  • Hearing Loss, Sensorineural / diagnosis
  • Hearing Loss, Sensorineural / surgery*
  • Humans
  • Male
  • Middle Aged
  • Prosthesis Design
  • Severity of Illness Index